<template>
    <el-menu
            :default-active="activeMenu"
            mode="horizontal"
            @select="handleSelect"
            :ellipsis="false"
    >
        <template v-for="(item, index) in topMenus">
            <el-menu-item :style="{'--theme': theme}" :index="item.path" :key="index" v-if="index < visibleNumber">
                <svg-icon
                        v-if="item.meta && item.meta.icon && item.meta.icon !== '#'"
                        :icon-class="item.meta.icon"/>
                {{ item.meta.title }}
            </el-menu-item>
        </template>

        <!-- 顶部菜单超出数量折叠 -->
        <el-sub-menu :style="{'--theme': theme}" index="more" v-if="topMenus.length > visibleNumber">
            <template #title>更多菜单</template>
            <template v-for="(item, index) in topMenus">
                <el-menu-item
                        :index="item.path"
                        :key="index"
                        v-if="index >= visibleNumber">
                    <svg-icon
                            v-if="item.meta && item.meta.icon && item.meta.icon !== '#'"
                            :icon-class="item.meta.icon"/>
                    {{ item.meta.title }}
                </el-menu-item>
            </template>
        </el-sub-menu>
    </el-menu>
</template>

<script setup>
    import {constantRoutes} from "@/router"
    import {isHttp} from '@/utils/validate'
    import useAppStore from '@/store/modules/app'
    import useSettingsStore from '@/store/modules/settings'
    import usePermissionStore from '@/store/modules/permission'

    // 顶部栏初始数
    const visibleNumber = ref(null);
    // 当前激活菜单的 index
    const currentIndex = ref(null);
    // 隐藏侧边栏路由
    const hideList = ['/index', '/user/profile'];

    const appStore = useAppStore()
    const settingsStore = useSettingsStore()
    const permissionStore = usePermissionStore()
    const route = useRoute();
    const router = useRouter();

    // 主题颜色
    const theme = computed(() => settingsStore.theme);
    // 所有的路由信息
    const routers = computed(() => permissionStore.topbarRouters);

    // 顶部显示菜单
    const topMenus = computed(() => {
        let topMenus = [];
        routers.value.map((menu) => {
            if (menu.hidden !== true) {
                // 兼容顶部栏一级菜单内部跳转
                if (menu.path === "/") {
                    topMenus.push(menu.children[0]);
                } else {
                    topMenus.push(menu);
                }
            }
        })
        return topMenus;
    })

    // 设置子路由
    const childrenMenus = computed(() => {
        let childrenMenus = [];
        routers.value.map((router) => {
            for (let item in router.children) {
                if (router.children[item].parentPath === undefined) {
                    if (router.path === "/") {
                        router.children[item].path = "/" + router.children[item].path;
                    } else {
                        if (!isHttp(router.children[item].path)) {
                            router.children[item].path = router.path + "/" + router.children[item].path;
                        }
                    }
                    router.children[item].parentPath = router.path;
                }
                childrenMenus.push(router.children[item]);
            }
        })
        return constantRoutes.concat(childrenMenus);
    })

    // 默认激活的菜单
    const activeMenu = computed(() => {
        const path = route.path;
        let activePath = path;
        if (path !== undefined && path.lastIndexOf("/") > 0 && hideList.indexOf(path) === -1) {
            const tmpPath = path.substring(1, path.length);
            activePath = "/" + tmpPath.substring(0, tmpPath.indexOf("/"));
            if (!route.meta.link) {
                appStore.toggleSideBarHide(false);
            }
        } else if (!route.children) {
            activePath = path;
            appStore.toggleSideBarHide(true);
        }
        activeRoutes(activePath);
        return activePath;
    })

    function setVisibleNumber() {
        const width = document.body.getBoundingClientRect().width / 3;
        visibleNumber.value = parseInt(width / 85);
    }

    function handleSelect(key, keyPath) {

        currentIndex.value = key;
        const route = routers.value.find(item => item.path === key);
  
        if (isHttp(key)) {
            // http(s):// 路径新窗口打开
            window.open(key, "_blank");
        } else if (!route || !route.children) {
            // 没有子路由路径内部打开
            const routeMenu = childrenMenus.value.find(item => item.path === key);
            if (routeMenu && routeMenu.query) {
                let query = JSON.parse(routeMenu.query);
                router.push({path: key, query: query});
            } else {
                router.push({path: key});
            }
            appStore.toggleSideBarHide(true);
        } else {
            // 显示左侧联动菜单
            activeRoutes(key);
            appStore.toggleSideBarHide(false);
        }
    }

    function activeRoutes(key) {
        let routes = [];
        if (childrenMenus.value && childrenMenus.value.length > 0) {
            childrenMenus.value.map((item) => {
                if (key == item.parentPath || (key == "index" && "" == item.path)) {
                    routes.push(item);
                }
            });
        }
        if (routes.length > 0) {
            permissionStore.setSidebarRouters(routes);
        } else {
            appStore.toggleSideBarHide(true);
        }
        return routes;
    }

    onMounted(() => {
        window.addEventListener('resize', setVisibleNumber)
    })
    onBeforeUnmount(() => {
        window.removeEventListener('resize', setVisibleNumber)
    })

    onMounted(() => {
        setVisibleNumber()
    })
</script>

<style lang="scss">
    .topmenu-container.el-menu--horizontal > .el-menu-item {
        float: left;
        height: 50px !important;
        line-height: 50px !important;
        font-size: 14px;
        font-weight: 500;
        color: #333;
        padding: 0 5px !important;
        margin: 0px !important;
        margin-left: 24px !important;
    }

    .topmenu-container.el-menu--horizontal > .el-menu-item.is-active, .el-menu--horizontal > .el-sub-menu.is-active .el-submenu__title {
        border-bottom: 2px solid #{'var(--theme)'} !important;
        color: #{'var(--theme)'};
    }

    .topmenu-container.el-menu--horizontal > .el-menu-item.is-active {
        color: #{'var(--theme)'};
        
    }

    /* sub-menu item */
    .topmenu-container.el-menu--horizontal > .el-sub-menu .el-sub-menu__title {
        float: left;
        height: 50px !important;
        line-height: 50px !important;
        color: #999093 !important;
        padding: 0 5px !important;
        margin: 0 10px !important;
    }

    /* 背景色隐藏 */
    .topmenu-container.el-menu--horizontal > .el-menu-item:not(.is-disabled):focus, .topmenu-container.el-menu--horizontal > .el-menu-item:not(.is-disabled):hover, .topmenu-container.el-menu--horizontal > .el-submenu .el-submenu__title:hover {
        background-color: #ffffff !important;
    }

    /* 图标右间距 */
    .topmenu-container .svg-icon {
        margin-right: 4px;
    }

    /* topmenu more arrow */
    .topmenu-container .el-sub-menu .el-sub-menu__icon-arrow {
        position: static;
        vertical-align: middle;
        margin-left: 8px;
        margin-top: 0px;
    }
</style>
